Photocatalytic activity of metalloporphyrin-sensitized TiO2 photocatalysts for degradation of organic contaminants in water
HU Baocheng1,2, LI Jun2*
(1 Gansu Forestry Technological College, Tianshui 741020, Gansu, China;2 College of Chemistry & Materials Science, Northwest University, Xi′an 710069, Shaanxi, China）
Abstract:
Three metalloporphyrin-sensitized TiO2 photocatalysts (CoTTP-TiO2 , CuTTP-TiO2 and ZnTTP-TiO2) were prepared and characterized by SEM, XRD and UV-Vis spectroscopy. It was found that surface modification of TiO2 by metalloporphyrins had a negligible influence on the size, dispersibility and phase structure of these photocatalysts. Their photocatalytic activities in photodegradation Rhodamine B and methylene blue were evaluated under the irradiation of high-pressure mercury lamp and metal halide lamp. The results revealed that these photocatalysts exhibited higher photodegradation efficiency than bare TiO2, and CoTTP-TiO2 showed the highest photocatalytic activity. These photodegradation reactions conform to the first-order kinetic equation.
KeyWords:
Titanium dioxide；metalloporphyrin；photocatalytic degradation；Rhodamine B；methylene blue
